Base Thread Size: 7/16 in.-14 Rocker Arm Nut Thread Size: 3/8 in.-24 Rocker Arm Stud Material: 8740 Chromoly Guideplate Locator Shank: No Rocker Arm Nut Thread Length (in.): 0.800 in. Effective Stud Length (in.): 1.750 in. Base Thread Length (in.): 0.700 in.